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Identification, Classification, and Growth of Moa Chicks (Aves: Dinornithiformes) from the Genus Euryapteryx

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Identification, Classification, and Growth of Moa Chicks (Aves: Dinornithiformes) from the Genus Euryapteryx Identification, classification, and growth of moa chicks (Aves: Dinornithiformes) from the genus Euryapteryx Author Huynen, Leon, Gill, Brian J, Doyle, Anthony, Millar, Craig D, Lambert, David M Published 2014 Journal Title PL o S One DOI https://doi.org/10.1371/journal.pone.0099929 Copyright Statement © 2014, Huynen et al. This is an Open Access article distributed under the terms of the Creative Commons Attribution License CCAL. (http://www.plos.org/journals/license.html) Downloaded from http://hdl.handle.net/10072/63679 Griffith Research Online https://research-repository.griffith.edu.au Identification, Classification, and Growth of Moa Chicks (Aves: Dinornithiformes) from the Genus Euryapteryx Leon Huynen1, Brian J. Gill2, Anthony Doyle3, Craig D. Millar4, David M. Lambert1* 1 Environmental Futures Centre, Griffith University, Nathan, Qld, Australia, 2 Auckland War Memorial Museum, Auckland, New Zealand, 3 Radiology with Anatomy, Faculty of Health and Medical Sciences, University of Auckland, Auckland, New Zealand, 4 Allan Wilson Centre for Molecular Ecology and Evolution, School of Biological Sciences, University of Auckland, Auckland, New Zealand Abstract Background: The analysis of growth in extinct organisms is difficult. The general lack of skeletal material from a range of developmental states precludes determination of growth characteristics. For New Zealand’s extinct moa we have available to us a selection of rare femora at different developmental stages that have allowed a preliminary determination of the early growth of this giant flightless bird. We use a combination of femora morphometrics, ancient DNA, and isotope analysis to provide information on the identification, classification, and growth of extinct moa from the genus Euryapteryx. Results: Using ancient DNA, we identify a number of moa chick bones for the species Euryapteryx curtus, Dinornis novaezealandiae, and Anomalopteryx didiformis, and the first chick bone for Pachyornis geranoides. Isotope analysis shows that h15N levels vary between the two known size classes of Euryapteryx, with the larger size class having reduced levels of h15N. A growth series for femora of the two size classes of Euryapteryx shows that early femora growth characteristics for both classes are almost identical. Morphometric, isotopic, and radiographic analysis of the smallest Euryapteryx bones suggests that one of these femora is from a freshly hatched moa at a very early stage of development. Conclusion: Using morphometric, isotopic, and ancient DNA analyses have allowed the determination of a number of characteristics of rare moa chick femora. For Euryapteryx the analyses suggest that the smaller sized class II Euryapteryx is identical in size and growth to the extant Darwin’s rhea. Citation: Huynen L, Gill BJ, Doyle A, Millar CD, Lambert DM (2014) Identification, Classification, and Growth of Moa Chicks (Aves: Dinornithiformes) from the Genus Euryapteryx. PLoS ONE 9(6): e99929. doi:10.1371/journal.pone.0099929 Editor: Tom Gilbert, Natural History Museum of Denmark, Denmark Received February 18, 2014; Accepted May 20, 2014; Published June 12, 2014 Copyright: ß 2014 Huynen et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. Funding: The authors thank the Australian Research Council for support (Grant number DP110101364; The molecular evolution of wings in ratites). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript. Competing Interests: The authors have declared that no competing interests exist. * E-mail: [email protected] Background number of samples of moa chick bones from sand-dune sites in New Zealand’s upper North Island, especially from the Karikari In depth analysis of growth in ancient animals is often limited Peninsula/Doubtless Bay area, including Tokerau Beach. Adult due to the scarcity and degraded nature of skeletal material or bones from these sites have been attributed to three moa species tissues of different ages. Similarly, the rare occurrence of different with most being derived from E. curtus curtus [2,6,7]. aged bones for New Zealand’s extinct ratite moa (Aves: To date, only one embryonic moa has been identified to species, Dinornithiformes) has made any analysis of moa growth difficult where bones associated with an egg were shown to belong to the [1,2,3]. heavy-footed moa Pachyornis elephantopus [2,8]. As bones of Adult moa ranged in size from less than 20 kg for the small developing chicks, which often lack identifying characters, are coastal moa Euryapteryx curtus curtus to over 200 kg for the South particularly difficult to identify [1,2] we use a minimally Island giant moa Dinornis robustus [2]. The identification of species destructive technique to genetically assign differently sized within the Euryapteryx genus has been particularly difficult. Latest immature moa femora to the species level. We then use bone data suggest the existence of a small subspecies (E. curtus curtus) morphometrics to present a growth series of chick femora for limited to New Zealand’s North Island, and a larger subspecies (E. Euryapteryx. In addition, we present isotope and radiographic data curtus gravis) found only in New Zealand’s South Island [4]. for the smallest moa femora to determine whether these may have How moa grew is largely unknown with most published work derived from unhatched eggs. The isotope data has also allowed us comparing moa to the growth characteristics of their extant to further explore the status of two subspecies proposed for moa relatives [2,3]. Relatively recent work analysing cortical growth from the genus Euryapteryx [9]. marks in moa limb bones suggest that, unlike their modern relatives, moa had a particularly long pre-adult growth period [5]. Results We analyse moa growth using a number of rare moa chick femora, currently housed at New Zealand’s Auckland Museum We successfully amplified a relatively short (,70 bp) hypervari- and kindly made available to us. The museum houses a significant able mitochondrial DNA fragment from 29 of 32 immature bones PLOS ONE | www.plosone.org 1 June 2014 | Volume 9 | Issue 6 | e99929 Growth in the Moa from the Genus Euryapteryx Table 1. Moa sequences. (Figure 3). No difference could be found in early femora growth characteristics between the two Euryapteryx classes. Morphometric and mass calculations were carried out on the smallest Euryapteryx Mt hpt. Sequence femur (LB12960; belonging to class II Euryapteryx) to determine whether this femur may have been from an unhatched egg. Two E1 -----G--------T-A-------------- femur-based equations exist that are commonly used to determine E5 -----G--------T-A---C---A------ avian mass; one using least shaft circumference provided by [15] E14 ---T-G--------T-A---C--------C- and one using total femur length [11] (see methods). Although both methods are relatively accurate for the determination of mass D15 —T—R-C-CC:---C:---C—T—CTC— of an avian adult, mass calculation using femur length has been P1 -C-------C-A-----AC----T------- shown to be more accurate for developing birds [16]. Using femur A1 -C-TC—G---:-----AT------------ length, estimated at c. 47 mm (measured at 44 mm but adding Cons CTCCTAAACTACCCCTT::TTCACGCTCTTC 3 mm to allow for missing ends) the mass of the LB12960 individual was calculated to be only 470 g. For Darwin’s rhea, Mitochondrial haplotypes (Mt hpt.) found and their sequences are shown. - very similar to class II Euryapteryx in adult size (15–28.6 kg) and identical base to consensus (Cons) sequence. : - gap. Haplotypes are numbered eggshell thickness (0.73–1.1 mm) [17] newly hatched individuals as reported in [7]. E - Euryapteryx curtus, D - Dinornis novaezealandiae, P - range in weight from 0.327–0.491 kg with an average weight of Pachyornis geranoides, A - Anomalopteryx didiformis. doi:10.1371/journal.pone.0099929.t001 0.426 kg [18]. This suggests that femur LB12960 may have derived from a moa embryo, but is likely to be from a very young newly hatched chick. Further analysis of the developmental stage of the smallest sampled from various locations in New Zealand (Tables 1,2; Eurypateryx femora was carried out by radiography. Six bones were Figures 1,2). Femur LB6261c was identified as belonging to analysed, of which four had essentially intact bone of variable Dinornis novaezealandiae and is 72 mm long (Table 2, Figure 2). thickness at the ends (Table 3). These ends correspond to the Bones of a late-term embryonic moa (identified as Pachyornis metaphyses of the femora adjacent to the growth plates, the elephantopus) were recovered from inside an egg in 1866 [2,8]. The epiphyses having been lost or separated. The ends of intact bones egg was 226 mm long and 155 mm wide with the embryonic suggest that the cartilage ‘cones’ described by [19] had already femur being approximately 48 mm long (with ends restored). An migrated away from the bone ends and growth plates. This is a egg found at Kaikoura and attributed to Dinornis was shown to be feature found in their study of rheas only after the birds were of 3 240 mm long, and by proportion, its embryo (if at the same stage weeks maturity or more. It is therefore reasonable to assume that as the Pachyornis egg) would have had a femur approximately these four chicks were a few weeks old at least. Only two of the 51 mm long. Therefore the size of LB6261c suggests it was from a moa chick bones had complete defects in the metaphyses, recent hatchling. Further evidence for the extreme immaturity of identifying them as neonatal or embryonic (Figure 4). One of this femur is the lack of caudal tuberosities on the femur shaft, a these (LB12960) has a slightly larger defect than the other and feature of the femur that separates Dinornis from the emeid moas subjectively has less trabecular bone overall than any of the others.
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